The form in which certain of the references to him are couched favours the above view; the compiler of Guiron le Cortois says in his prologue that "maistre Gautier Map qui fu clers au roi Henrydevisa cil l'estoire de monseigneur Lancelot du Lac, que d'autre chose ne parla it mie gramment en son livre"; and in another place he refers to Map, "qui fit lou pro pre livre de monsoingnour Lancelot dou Lac."

In May 1314, by order of King Philip IV., she was arrested and imprisoned in the Chateau-Gaillard with her sisterin-law Marguerite, daughter of Robert II., duke of Burgundy, and wife of Louis Hutin, on the charge of adultery with two gentlemen of the royal household, Philippe and Gautier d'Aunai.